Preparation And Luminescence Properties Of Rare Earth Doped CsPbI₃ Quantum Dot Glass-ceramics

All-inorganic cesium lead halide perovskite materials(Cs Pb X₃,X=I,Br,Cl)have attracted attention due to their strong light absorption,low exciton binding energy,and excellent luminous properties and luminous tenability.In particular,it has a very wide range of potential applications in the fields of lighting,display,sensing,bio-imaging and photovoltaics.However,perovskite nanomaterials also affect its practical application because of some inherent defects such as poor stability.Therefore,in this paper,CsPbI₃ QDs were grown in situ in borosilicate glass,protected by a transparent inert glass,and its optical properties were improved by rare earth doping.And its potential applications in non-contact fluorescent temperature sensors and plant lighting are mainly discussed.(1)The formulation of CsPbI₃ QDs@glass,specific parameters of heat treatment temperature and time were explored.A series of glass components were prepared by high-temperature solid-phase method,and it was found that the glass had the best luminous performance when the formula of X=1.5.In addition,the optimal crystallization temperature and annealing time of CsPbI₃ QDs@glasses were found by controlling the variable method,which were 853 K and 30 h.The samples with the best luminous properties were subsequently tested for thermal stability,and it was found that after a heating and cooling cycle,the luminescence could return to the original 92%.(2)Exploring the potential application of CsPbI₃:Tb³⁺QDs@glass in non-contact fluorescent temperature sensors.Moreover,it was found that the photoluminescence quantum yield and transparency of CsPbI₃ QDs@glasses can be significantly improved by doping Tb³⁺,which is best when doping is 1.0 mol%,and the quantum efficiency can reach about 45%.After ten heating-cooling cycles,it was found that the emission intensity of CsPbI₃ QDs and Tb³⁺ions can still be recovered to more than 97%.Then,in the temperature range of 293 K to 453 K,the red and green fluorescence intensity of CsPbI₃ QDs and Tb³⁺ions were used to study the large difference in thermal quenching behavior.Ratio-based visual optical temperature measurement technology.(3)The effects of Pr³⁺doping on the luminescent properties of CsPbI₃quantum dot glass-ceramics and potential applications in plant lighting were explored.CsPbI₃quantum dot glass-ceramics doped with Pr³⁺ions were successfully prepared,and the optimal doping concentration of Pr³⁺was 1.0 mol%of glass,and PLQY was as high as 49.11%.In addition to higher PLQY,it also has extremely high temperature and thermal stability and water stability.After three cycles of heating and cooling and 480h immersion in water,the emission intensity can still be maintained at 97%and 95%of the original value,respectively.Subsequently,the modified materials are packaged into LED devices packaged with red light chips and applied to plant supplemental lighting.